Thanks, Misterm. as you mentioned, there are some meshes that didn't transfer properly between Godot4 and Itch.io, also the shadows disappeared. I'll see what I can do to fix this in future versions. The lag seemed to drastically reduce after I played the game a coupe of times, but there are probably many things I can do to improve the efficiency and reduce bloat.
Thank you for the review and the advice, I really appreciate it!